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Diagnostic procedure

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
STEP INSPECTION RESULTS ACTION
1 Are any driveability or exhaust smoke concerns present? Yes Go to the appropriate flow chart.
No Go to the next step.
2 Inspect the following:
  • Electrical connections
  • Vacuum lines
  • Fuel quality

Are all items normal?		 Yes Go to the next step
No Service if necessary.
Repeat Step 2.
3 Connect the M-MDS to the DLC-2.
Switch the ignition to ON (Engine off).
Retrieve any DTCs
Are there any DTCs displayed?		 Yes DTC is displayed: 
Go to the appropriate DTC inspection.
(See DTC TABLE [L5] .)
No No DTC is displayed: 
Go to the next step.
4 Inspect the fuel line pressure.
(See FUEL LINE PRESSURE INSPECTION [L5] .)
Is the fuel line pressure correct?		 Yes Go to the next step.
No Low: 
Inspect the fuel pump relay and the fuel pump circuit.
Inspect the fuel line for clogging.
If there is no malfunction, replace the fuel pump unit
(See FUEL PUMP UNIT REMOVAL/INSTALLATION [L5] .)
High: 
Replace the fuel pump unit
(See FUEL PUMP UNIT REMOVAL/INSTALLATION [L5] .)
5 Inspect the charcoal canister for fuel saturation
Is an excess amount of liquid fuel present in the canister?		 Yes Replace the charcoal canister.
(See CHARCOAL CANISTER, CANISTER VENT (CV) SOLENOID VALVE, AIR FILTER COMPONENT REMOVAL/INSTALLATION [L5] .)
No Inspect the fuel tank vent system
If the fuel tank vent system is normal, suggest trying a different brand since the sulfur content can vary in different fuels
If the fuel tank vent system is not normal, repair or replace the malfunctioning part
6
  • Verify test results.
    • If normal, return to the diagnostic index to service any additional symptoms

      (See SYMPTOM DIAGNOSTIC INDEX [L5] )

    • If the malfunction remains, inspect the related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis.
      • If the vehicle is repaired, troubleshooting is completed
      • If the vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if a later calibration is available Retest
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